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= Tutorial Step 2 =
* '''Goal''': Build a simple Hello World application
* '''Requirements''': 
** know how to compile with Eiffel (EiffelStudio).
** [[step_1.wiki|Previous step]]  completed


== "hello" project ==
* using the "wsf" library:
** It provides service, request, response, ...
* using the "default_standalone" library
** This is used to build the application in a portable manner, but for this compilation, it uses the standalone web server as connector.
** We use that standalone connection this tutorial, because there is no need to configure any apache, iis, and so on. And it is convenient to execute with EiffelStudio debugger.

* To see the result, you should open http://localhost/ on your web browser. Note if the application is using another port such as 9999, you should open http://localhost:9999/

* You will find inside [[step_2]] the "hello" project
** target "hello" provides a very simple implementation (But by default, it is using port 80 with standalone web server, which might already be busy by other application)
** target "hello_custom" which uses almost the same code, but in addition, you can use the ewf.ini file to precise the port number (9999 for this example)

* To see the result, open http://localhost/ in a web browser.
* Note, if the application is using port different from 80, such as 9999, open http://localhost:9999/

* Eiffel code
 class
 	HELLO_APPLICATION

 inherit
 	WSF_DEFAULT_SERVICE [HELLO_EXECUTION]

 create
 	make_and_launch
 
 end

 class
     HELLO_EXECUTION
 
 inherit
     WSF_EXECUTION
 
 create
     make

 feature -- Execution

 	execute
 		local
 			msg: WSF_PAGE_RESPONSE
		do
 			create msg.make_with_body ("Hello World")
 			response.send (msg)
 		end
 
 end

Note: we could also declare the root class as being "WSF_DEFAULT_SERVICE [HELLO_EXECUTION]" to avoid this HELLO_APPLICATION class.

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